High-pressure ^4He drift tubes for fissile material detection
Creators
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Wang, Zhehui1
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Morris, Christopher L.1
- Gray, F. E.2
- Bacon, J. D.1
- Brockwell, M. I.1
- Chang, D. Y.1
- Chung, K.1
- Dai, W. G.1
- Greene, S. J.1
- Hogan, G. E.1
- Lisowski, P. W.1
- Makela, M. F.1
- Mariam, F. G.1
- McGaughey, P. L.1
- Mendenhall, M.3
- Milner, E. C.1
- Miyadera, H.1
- Murray, M. M.1
- Perry, J. O.1
- Roybal, J. D.1
- Saunders, A.1
- Spaulding, R. J.1
- You, Z.4
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1.
Los Alamos National Laboratory
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2.
Regis University
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3.
California Institute of Technology
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4.
University of California, Irvine
Abstract
A detector efficiency model based on energy extraction from neutrons is described and used to compare ^4He detectors with liquid scintillators (EJ301/NE-213). Detector efficiency can be divided into three regimes: single neutron scattering, multiple neutron scattering, and a transition regime in-between. For an average fission neutron of 2 MeV, the amount of ^4He needed would be about 1/4 of the amount of the mass of EJ301/NE-213 in the single-scattering regime. For about 50% neutron energy extraction (1 MeV out of 2 MeV), the two types of detectors (^4He in the transition regime, EJ301 still in the single-scattering regime) have comparable mass, but ^4He detectors can be much larger depending on the number density. A six-tube 11-bar-pressure ^4He detector prototype is built and tested. Individual electrical pulses from the detector are recorded using a 12-bit digitizer. Differences in pulse rise time and amplitudes, due to different energy loss of neutrons and gamma rays, are used for neutron/gamma separation. Several energy spectra are also obtained and analyzed.
Additional Information
© 2012 Elsevier B.V. Received 20 July 2012. Received in revised form 20 October 2012. Accepted 6 November 2012. Available online 17 November 2012. This work was supported in part by the Defense Threat Reduction Agency (DTRA) of the Department of Defense.Additional details
Identifiers
- Eprint ID
- 37660
- DOI
- 10.1016/j.nima.2012.11.019
- Resolver ID
- CaltechAUTHORS:20130328-075745668
Related works
- Describes
- 10.1016/j.nima.2012.11.019 (DOI)
Funding
- Defense Threat Reduction Agency (DTRA)
Dates
- Created
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2013-03-28Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field